App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 438 · 40 questions

Developer's tip (Big and bold): Our rule: every button is at least 48 px tall. Missing px = 48 − height. Leave space between buttons; use clear words like Save or Send. Strong contrast (black on yellow, white on dark green) is easy to read; similar colours are hard.

1. 1.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 44 px tall. How many px taller must it be?
3. 3.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
4. 4.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Done button: 60 px tall
   Send button: 40 px tall
   Cancel button: 52 px tall (a) Send (b) Done (c) Cancel
5. 5.🔘 Our rule: buttons are at least 48 px tall. The Start button is 40 px tall. How many px taller must it be?
6. 6.Which colour pair is hard to read? (a) white on black (b) red on green (c) dark blue on white (d) black on yellow
7. 7.Which colour pair is hard to read? (a) white on dark green (b) white on black (c) dark blue on black (d) black on yellow
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Next button: 40 px tall
   Send button: 40 px tall
   Back button: 60 px tall
   Start button: 64 px tall
10. 10.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
11. 11.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) red on green (d) white on black
12. 12.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
14. 14.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 28 px tall
    Save button: 68 px tall
    Cancel button: 72 px tall
    Send button: 52 px tall (a) Cancel (b) Save (c) Send (d) Done
15. 15.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 48 px tall
    Done button: 64 px tall
    Cancel button: 64 px tall
16. 16.Which colour pair is hard to read? (a) black on pale grey (b) white on black (c) dark blue on white (d) yellow on white
17. 17.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
18. 18.🔘 Our rule: buttons are at least 48 px tall. The Done button is 20 px tall. How many px taller must it be?
19. 19.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 68 px tall
    Save button: 40 px tall
    Send button: 52 px tall (a) Save (b) Send (c) Back
20. 20.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 48 px tall
    Send button: 40 px tall
    Back button: 48 px tall (a) Back (b) Save (c) Send
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 60 px tall
    Start button: 48 px tall
    Cancel button: 52 px tall
23. 23.True or false: space between buttons is poor button design. (a) False (b) True
24. 24.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
25. 25.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 64 px tall
    Send button: 48 px tall
    Back button: 36 px tall (a) Cancel (b) Send (c) Back
27. 27.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 48 px tall
    Save button: 48 px tall
    Cancel button: 44 px tall
29. 29.Which colour pair is easy to read? (a) black on yellow (b) light grey on white (c) pale pink on white (d) red on green
30. 30.True or false: a clear word like Save is poor button design. (a) True (b) False
31. 31.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 60 px tall
    Next button: 44 px tall
    Done button: 64 px tall
33. 33.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 44 px tall
    Done button: 32 px tall
    Cancel button: 60 px tall
    Next button: 32 px tall
35. 35.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
36. 36.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Start button: 40 px tall
    Cancel button: 48 px tall (a) Back (b) Start (c) Cancel
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 40 px tall
    Back button: 48 px tall
    Cancel button: 52 px tall
    Send button: 68 px tall (a) Cancel (b) Save (c) Send (d) Back
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 60 px tall
    Back button: 60 px tall
    Next button: 68 px tall
    Cancel button: 28 px tall (a) Back (b) Next (c) Cancel (d) Start
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 52 px tall
    Cancel button: 64 px tall
    Start button: 36 px tall

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